SDI 3G with CWDM

Top SDI 3G with CWDM

Definition and basic information

3G SDI devices with CWDM support (detailed descriptions of both systems below) are the perfect set of video interfaces for professional applications.

SDI stands for serial digital interface and contains a package of digital video interfaces first standardized by SMPTE (The Society of Motion Picture and Television Engineers) in 1989.


Additional SDI standards have been introduced to support increasing video resolutions (HD, UHD and others), frame rates, three dimensional videos and color depth. Dual link HD-SDI consists of a pair of SMPTE 292M links, standardized by SMPTE 372M in 1998 3G-SDI (standardized in SMPTE 424M) consists of a single 2.970 Gbit/s serial link that allows replacing dual link HD-SDI, newer standards 6G-SDI and 12G-SDI were published on March 19, 2015.

These standards are used to transmit uncompressed, unencrypted digital video signals (optionally including embedded audio and time code) within television facilities. They can also be used for transmitting packetized data. Coaxial variants of the specification range in length but are typically less than 300 meters. Fiber optic variants of the specification such as 297M allow for long-distance transmission limited only by maximum fiber length. SDI and HD-SDI are usually available only in professional video equipment because various licensing agreements restrict the use of unencrypted digital interfaces, such as SDI, prohibiting their use in consumer equipment. Several professional video and HD-video capable DSLR cameras and all uncompressed video capable consumer cameras use the HDMI interface, sometimes called clean HDMI or unencrypted HDMI. 


CWDM stands for Coarse Wavelength Division Multiplexing - a wavelength multiplexing technique used in fiber optic transmission technology. The two most important ITU-T recommendations defining the technique of wave multiplication of CWDM are G.694.2 (Spectral grids for WDM applications: CWDM wavelength grid) and G.695 (Optical interfaces for coarse wavelength division multiplexing applications).

Recommendation G.694.2 defines 18 channels of CWDM, from 1271 nm to 1611 nm, with channel spacing equal to 20 nm (it is worth noting the mutual shift of the nominal central wavelengths of lasers and CWDM filters by 1 nm, in order to symmetry the temperature window). Traditionally, the 1371 nm and 1391 nm channels have been rarely used, due to the occurrence of the so-called "white light" water peak in old type fiber optics. At present, however, the quality of G.652.D standard fibers allows to use full 18 channels of CWDM. In some situations the use of low channels (1271 nm and 1291 nm) may be problematic, as some G.652.D fibers of low quality may not guarantee homogeneity in this region. Application of CWDM transmission on other types of single-mode fibers (e.g.  G.655) requires attention and caution, as not all CWDM channels can be supported due to dispersion properties, spectral damping profile or cut-off wavelength.


List of the Best 3G-SDI with CWDM Devices


 

This device is a 1 Channel HD-SDI transmitter and receiver for sending high definition digital video HD-SDI signals over fiber optic cable for long distance transport. This unit is used for sending HD-SDI signals over distances as far as 100 miles.

Features

  • Compatible with any Serial Digital Signal up to 3.0 Gbps
  • Available with internal optics for use with a single optical fiber
  • Standardized channels for both CWDM bands for compatibility with Python™ systems
  • Passes SDI embedded audio and all ancillary data
  • Input equalization and reclocking for SDI video on buffered outputs
  • Available in any custom configuration for Bi-Directional Transport up to 16 total channels
  • Real-time status LED indicators for troubleshooting and monitoring
  • DWDM systems available by request for higher density systems
This Device is a 4 Channel HD-SDI transmitter and receiver for sending high definition digital video HD-SDI signals over fiber optic cable for long distance transport. This unit is used for sending 3G-SDI signals over distances as far as 150 miles.

Features

• Compatible with any Serial Digital Signal up to 3.0 Gbps
• Available with internal optics for use with a single optical fiber
• Standardized channels for both CWDM bands for compatibility with Python™ systems
• Passes SDI embedded audio and all ancillary data
• Input equalization and reclocking for SDI video on buffered outputs
• Available in any custom configuration for Bi-Directional Transport up to 16 total channels
• Real-time status LED indicators for troubleshooting and monitoring
• DWDM systems available by request for higher density systems

This device is an 8 Channel 3G SDI / HD-SDI running at 3.0 Gbp transmitter and receiver. This unit sends high definition digital video 3G SDI / HD-SDI Independent signals over fiber optic cable 3G-CWDM Uncompressed for long distance up to 120km

Features

• Compatible with any Serial Digital Signal up to 3.0 Gbps
• Available with internal optics for use with a single optical fiber
• Standardized channels for both CWDM bands for compatibility with Python™ systems
• Passes SDI embedded audio and all ancillary data
• Input equalization and reclocking for SDI video on buffered outputs
• Available in any custom configuration for Bi-Directional Transport up to 16 total channels
• Real-time status LED indicators for troubleshooting and monitoring
• DWDM systems available by request for higher density systems

This device is a 6 Channel 3G SDI / HD-SDI running at 3.0 Gbp transmitter and receiver. This unit sends high definition digital video 3G SDI / HD-SDI Independent signals over fiber optic cable 3G-CWDM Uncompressed for long distance up to 150 miles

Features

• Compatible with any Serial Digital Signal up to 3.0 Gbps
• Available with internal optics for use with a single optical fiber
• Standardized channels for both CWDM bands for compatibility with Python™ systems
• Passes SDI embedded audio and all ancillary data
• Input equalization and reclocking for SDI video on buffered outputs
• Available in any custom configuration for Bi-Directional Transport up to 16 total channels
• Real-time status LED indicators for troubleshooting and monitoring
• DWDM systems available by request for higher density systems

Multiple 4k over the fiber transmiter receiver. 3G SDI signals over the 1 fiber with or without embedded audio and data

Features

  • CWDM optical multiplexing technology, Each SDI signal has its own laser and its beeing convert to the different optical wavelength
  • Compliant with SMPTE ST 425-3, ST 425-5, 259M-2006, 292-2006, 424M-2006
  • Supports transmission of SMPTE 305M-2005, 310M-2004, 344M-2000,
  • Signal is equalized and re-clocked prior to fiber optic transmission
  • Receiver features four re-clocked SDI outputs
  • Supports pathological patterns over entire link budget and operating temperature range
  • Supports both Single Mode and Multimode (62.5u & 50u) fiber types
  • Supports 3G/HD/SD-SDI inputs with or without embedded audio and data
  • Supports 4K/UHD resolutions up to 60 fps
  • 21 dB Optical Link Budget @ 2.97 Gbps for High Power, Longer Distance version
  • Standard & High Powered, long distance transmitter versions available
  • Available in compact and 19" rackmount versions
This Device is a 1 to 8 Channel Universal platform for multiplexing SD/HD 3G SDI, DVB-ASI, Analog CVBS Video, Analog Audio, AES/EBU Audio, RS Data, 10/100 and Gigabit Ethernet over 1 Fiber Cable

Features

  • Compact design with 1U height, 19 inch, which can be installed on standard rack
  • Optical port
    • Supports optical signal loss indication
    • With APC circuit to achieve stable output optical power
    • Two reserved optical ports for cascaded application. The available wavelength can be ordered.
    • Supports FC/SC/ST-PC connector
  • SDI
    • Supports 1485Mb/s and 270Mb/s, complying with SMPTE-292M and SMPTE-259M
    • Supports DVB-ASI at 270M/b
    • As an option, supports 2970M/b, complying with SMPTE-424M 3G-SDI
    • SDI loop out and dual SDI output can be selected at the transmission and receiving terminals respectively
    • Supports [email protected], 50, [email protected], 29.97, 25, 24, 23.98, [email protected], 59.94, 50,  [email protected], 59.94, 50, 30, 29.97, 25, 24, 23.98, and 625i, 525i
    • With integrated SDI re-clocker and cable equalizer
    • Built-in ESD and surge protection facility to prevent damage from external strikes
    • Supports lock status indication of SDI input and output
  • DVB-ASI  /SMPTE310
  • Serial data over 75-ohm coaxial cable at rates at or less than 270 megabits per second
  • Transmission of an MPEG Transport Stream MPEG2-TS / H-264-TS
  • 75ohm BNC Connector
  • The 188 / 204 byte format supported
  • Gigabit Ethernet
    • Complying with IEEE 802.3, auto negotiation for 10M/100M/1000M
    • One RJ45 connector for one gigabit Ethernet, support auto MDI/MDIX function
    • Indicators for LINK/ACT and bit rate status
  • Analog or AES/EBU Audio(XLR interface)
    • Up to 8 balanced XLR interfaces
    • Supports AES/EBU or S/PDIF audio format transparent transmit with bit rate of 3.072Mb/s
    • Supports AES/EBU or S/PDIF audio lock status indication
  • Auxiliary service
    • Phoenix terminal interface, every five terminals are used as a group and the service type can be configured for every group independently
    • Supports audio, RS232, RS422, RS485 and contact closure
  • Provides dual power redundancy: AC220V/AC110V, DC-48V and DC+24V can be selected

 

Summary

The length of the CWDM link in most cases is limited by the power budget. In rare cases, a dispersion restriction is also important for 10G lines. The available power budget for 1G lines is up to 40 dB, for 10G lines it rarely exceeds 24 dB.  Although typically CWDM links use two transmission fibers (each for one-way signal transmission), it is possible to combine a duplex CWDM link on a single fiber. In most cases, this means halving the capacity of the link (i.e. the possibility of combining up to 9 duplex transmissions instead of the normally available 18). The CWDM system allows the use of lasers without a thermoelectric cooling element, which leads to lower costs compared to a DWDM system. Thor Fiber offers up Simplex units for simplicity in throw down situations and applications where fiber is hard to comeby. 



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